Hp NonStop G-Series Manual de usuario descargar pdf (Pagina 116)

User Hook Library

Extending the Tandem DDE Gateway

8–14 110838 Tandem Computers Incorporated

If pbSupportedFormat is zero, then you can do the data conversion in your User Hook

Library by returning non-zero in pbSupportedFormat and non-zero in

pbConvertWithOnlyHookCode.

If pbSupportedFormat is non-zero, you can force the client application to hunt for

another clipboard format by setting pbSupportedFormat to zero. If your User Hook

Library contains TdmgwHookDdePokePreConvert and/or

TdmgwHookDdeRequestPostConvert functions, this is useful if you want the client

application to hunt until it gets to a clipboard format that can be understood by those

functions.

Prototype

BOOL FAR PASCAL TdmgwHookIsConvSupported

(HWND hMainWnd, in

unsigned long ulInitializeServiceSerialNumber, in

LPSTR lpServiceName, in

struct tagDdeDictElementData far * pstructElementData, in

WORD cfFormat, in

int nDdePokeOrRequest, in

BOOL far * pbSupportedFormat, in/out

BOOL far * pbConvertWithOnlyHookCode, out

struct tagTdmgwErrorMsg far * pstructErrMsg); out

Parameters

Return Value Zero = Error. Non-zero = No error.

hMainWnd Window handle of Tandem DDE Gateway main

window.

ulInitializeServiceSerialNumber Number incremented with each

INITIALIZESERVICE command. Starts at zero

when the Gateway is started. Rolls over to zero

after 4,294,967,295.

lpServiceName Current ServiceName object (from

INITIALIZESERVICE command).

pstructElementData Description of current data element. (See the

“Tandem DDE Gateway Dictionary Structure”

topic).

cfFormat Clipboard format of DDE Request function.

nDdePokeOrRequest Indicates whether the call to the User Hook Library

was caused by a DDE Poke or a DDE Request

function:

TDMGW_HOOK_DDE_POKE = DDE Poke

TDMGW_HOOK_DDE_REQUEST = DDE Request

pbSupportedFormat Zero = Data conversion between cfFormat and

Tandem data representation is not supported.

Non-zero = Data conversion between cfFormat and

Tandem data representation is supported.

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